Page 11 - eBook T2 eISBN2
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Figure 2.1: Illustrates nucleus, electron and orbits surrounding nucleus
Nucleus of Atom
Nucleus is located at the center of atom. The diameter of nucleus is about 1/10000 of diameter
of whole atom. Almost whole mass of atom is concentrated in its nucleus. Nucleus itself
consists of two kinds of particles,
1. Proton
2. Neutron
Proton
Protons are positively charged particles. Charge on each proton is 1.6 × 10-19 Coulomb. The
number of protons in nucleus of an atom represents the atomic number of atoms.
Neutron
Neutrons do not have any electrical charge. Means, neutrons are electrically neutral particles.
The mass of each neutron is equal to mass of the proton.
The nucleus is positively charged due to the presence of positively charged protons. In any
material, the weight of the atom and radioactive properties are associated with the nucleus.
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